When converting this string 130,8000 using Double.parseDouble , this error occurred. What needs to be fixed?

Code

 double temp = (Double.parseDouble(ud.getText().toString()) * Double.parseDouble(prv.getText().toString()));

Mistake

 Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "130,8000" at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043) at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110) at java.lang.Double.parseDouble(Double.java:538) at myTable.comapre10(myTable.java:650) at myTable$1.actionPerformed(myTable.java:156) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6533) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6298) at java.awt.Container.processEvent(Container.java:2236) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) at java.awt.Container.dispatchEventImpl(Container.java:2280) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
  • Did you try to replace the comma with a dot? - Andrey M
  • No, I have not tried. Thanks It works! - Mr Klonwar

2 answers 2

In Java, fractional numbers are written through a dot. If you use a comma, then you need to either replace it with a period.

 String str = "130,8000".replace(',', '.'); double temp = Double.parseDouble(str);

either parse based on a specific locale

 NumberFormat format = NumberFormat.getInstance(Locale.FRANCE); Number number = format.parse("130,8000"); double d = number.doubleValue();
  • one
    In Java, fractional numbers are stored in their internal format, and when displayed, in the most common Western formats (EN-US, etc.), a period is used as a separator for the floating part. This is to "In Java, fractional numbers are written through a dot," which is not entirely correct. The answer to the question is correct. - lospejos

I believe that the problem is a comma. You must use the appropriate formatting:

 NumberFormat format = NumberFormat.getInstance(Locale.FRANCE); Number number = format.parse(prv.getText().toString()); double d = number.doubleValue();